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Investments - Net Investment Income and Investment Gains (Losses) (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net Investment Income [Line Items]
Net unrealized gains (losses) on trading securities	$ 44	$ (25)
Nonredeemable Preferred Stock [Member]
Net Investment Income [Line Items]
Net realized gains (losses) on trading securities	42	(15)
Fixed Maturity Securities [Member]
Net Investment Income [Line Items]
Gross realized gains on available-for-sale securities	36	69
Gross realized losses on available-for-sale securities	$ 42	$ 51

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- Definition

This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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No definition available.

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- Definition

This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of gain (loss) realized from securities classified as trading.

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- Definition

Amount of unrealized holding gain (loss) recognized in the income statement for investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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No definition available.

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